US PATENT SUBCLASS 218 / 73
.~.~.~.~ With throat region

Current as of: June, 1999
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218 /   HD   HIGH-VOLTAGE SWITCHES WITH ARC PREVENTING OR EXTINGUISHING DEVICES

1  DF  ARC PREVENTING OR EXTINGUISHING DEVICES {14}
43  DF  .~ Air-current blowout {18}
68  DF  .~.~ Sealed chamber {10}
72  DF  .~.~.~ With nozzle {1}
73.~.~.~.~ With throat region

DEFINITION

Classification: 218/73

With throat region:

(under subclass 72) Subject matter wherein the nozzle has a narrow passage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

54, for air-current blowout circuit interrupter.

64, for puffer piston circuit interrupter.